One Direction performs on the Today Show March 12, 2012.Photo: Getty Images

If you don't already know the names of these smiley eyed boys by heart, break out the flashcards and get cramming. The dapper little gents before you (Niall Horan, Louis Tomlinson, Zayn Malik, Liam Payne, and *SIGH* Harry Styles) make up the latest batch of heartbreakers flying up on teen girls' bedroom walls across the country. They're British-Irish boy band One Direction (for a free download GO TO HERE)! They've been making waves across the pond for the past few months, but their album "Up All Night" just dropped stateside last week and is already making history as they're the first UK group to EVER debut their debut album at No. 1 on the American charts. Watch out Bieber. *wink*

Along with their silky smooth pipes and baby soft faces, these boys have some seeeerious style game. Their color-coordination is airtight with nary a single shade off or clashing. The smart tailoring, tippy-top buttoned shirts, nautical stripes, and skinny lapel blazers (with pocket squares!!) galore are just soooo English gentleman that we (along with much of the ladybaby population) can hardly contain ourselves. EGAD, these boys are KA-YOOT!!!! And notably, repping a squeaky clean yet also fashion-forward look we haven't seen in boy band steez for quite a long time. In honor of One Direction, the major milestones the group is hitting (soon to perform at the Kids' Choice Awards and SNL!), and their on-point collective style, we're taking a look back at how the boy band look has evolved over time. Walk with us.

Members:Michael Jackson, Jackie Jackson, Tito Jackson, Jermaine Jackson, Marlon JacksonHottest Singles: "I Want You Back," "ABC," "I'll Be There"The Style: The Jackson 5 had the advantage of reaching their height in the '70s when colorful vestments were king (and so were they). BRIGHT palettes, soaring wide collars, flares, and an unabashed wielding of prints were key for their look. Also, matching haircuts.

Members:Gary Barlow, Howard Donald, Jason Orange, Mark Owen, Robbie WilliamsHottest Singles: "It Only Takes A Minute," "I Found Heaven," Pray"The Style: UK boy band Take That reached their peak right around when the boys of One Direction were born/growing up, so it's very likely they had a large influence on Harry et. al. Thankfully, though, Take That's backwards Kangol ivy caps and denim leisure suits were left in the '90s.

Members:Nathan Morris, Shawn Stockman, Wanya Morris, Michael McCaryHottest Singles:"Motownphilly," "It's So Hard to Say Goodbye to Yesterday," "End Of The Road"The Style: The incomparable legendary vocals of Boyz II Men need not be distracted from with flashy, gimmicky performance wear. The Philly boys often kept things simple, replicating one outfit (down to the accessories!) four times over for each of the members.

Members:Nick Lachey, Drew Lachey, Jeff Timmons, Justin JeffreHottest Singles: "Invisible Man," "True To Your Heart," "Because of You"The Style: When the boys of 98 Degrees weren't illustrating the HOTNESS of their group by appearing in chili pepper red jumpsuits, they were wearing form-fitting, muscle-displaying sweaters. When all else failed, they just took off their shirts.

Members: G-Dragon, Taeyang, T.O.P., Daesung, SeungriHottest Singles: "Day By Day," "Heaven," "Oh My Friend"The Style: Big Bang is not only One Direction's stiffest competition on the current boy band landscape, they're also arguably JUST as expertly styled. Where One Direction errs on the side of ivy leauge chic, Big Bang is a bit grittier and more FASHUN, coordinating custom Hermes jackets and Minx nails.

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